Need a manual or better schematic for Polk Audio Powered Subwoofer Model PSW50

SOURCE: I need an instructional manual

At this link you can see and download the user manual for your Polk Audio Sub-woofer. In case you need further details for installation or in case of a problem or clarification, don't hesitate to post me a reply before rejecting my answer.
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Stelios
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SOURCE: Have a blown vintage polk

It measures in at just under 4 ohms, so assume a 4 ohm speaker. You can replace this with any number of similar subs, using perennial DIY favorite PartsExpress, there are two under $30 that would meet your needs (Dayton SD215-88 and Goldwood GW408). Looks like they both have dual 8 ohm coils, so you would simply wire them in parallel for your application.